Consider the Wave dataset containing angular measurements
corresponding to minimal acoustic pressure in ultrasonic radiation fields.
Perform the following analyses:

a) Determine the mean directions of the TRa and TRb
measurement sets.

b) Show that both measurement sets support at a 5%
significance level the hypothesis of a von Mises distribution.

c) Compute the 95% confidence interval of the mean direction
estimates.

d) Compute the concentration parameter for both measurement
sets.

e) For the two transducers TRa and TRb, compute the angular
sector spanning 95% of the measurements, according to a von Mises distribution.